[Bug tree-optimization/62238] New: ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[Bug tree-optimization/62238] New: ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

            Bug ID: 62238
           Summary: ICE with LTO on valid code on x86_64-linux-gnu in
                    verify_ssa (in 64-bit mode)
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled with the current gcc trunk (as
well as 4.9.x) with LTO on x86_64-linux-gnu in 64-bit mode (but not in 32-bit
mode).

It is a regression from 4.8.x.

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 5.0.0 20140823 (experimental) [trunk revision 214394] (GCC) 
$ 
$ gcc-trunk -O0 -c fn1.c
$ gcc-trunk -O0 -c main.c
$ gcc-trunk -O3 *.o
$ ./a.out
$ 
$ gcc-4.8 -flto -O0 -c fn1.c
$ gcc-4.8 -flto -O0 -c main.c
$ gcc-4.8 -flto -O3 *.o
$ ./a.out
$ 
$ gcc-trunk -flto -O0 -c fn1.c
$ gcc-trunk -flto -O0 -c main.c
$ gcc-trunk -flto -O3 *.o
fn1.c: In function ‘fn1’:
fn1.c:4:1: error: missing definition
 fn1 (int p)
 ^
for SSA_NAME: _73 in statement:
_32 = (unsigned int) _73;
fn1.c:4:1: internal compiler error: verify_ssa failed
0xab6be1 verify_ssa(bool, bool)
    ../../gcc-trunk/gcc/tree-ssa.c:1055
0x830f4b execute_function_todo
    ../../gcc-trunk/gcc/passes.c:1758
0x831a23 execute_todo
    ../../gcc-trunk/gcc/passes.c:1808
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: fatal error: gcc-trunk returned 1 exit status
compilation terminated.
/usr/bin/ld: fatal error: lto-wrapper failed
collect2: error: ld returned 1 exit status
$ 
$ cat fn1.c
int a[4], b, c, d; 

int
fn1 (int p)
{
  for (; d; d++)
    {
      unsigned int h;
      for (h = 0; h < 3; h++)
    {
      if (a[c+c+h])
        {
          if (p)
        break;
          return 0;
        }
      b = 0;
    }
    }
  return 0;
}
$ cat main.c
extern int fn1 (int);

int
main ()
{
  fn1 (0);
  return 0;
}
$
>From gcc-bugs-return-459092-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 23 14:09:38 2014
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From: "d.g.gorbachev at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/62239] New: [5 Regression] ICE: in execute_todo, at passes.c:1795 with LTO
Date: Sat, 23 Aug 2014 14:09:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idb239

            Bug ID: 62239
           Summary: [5 Regression] ICE: in execute_todo, at passes.c:1795
                    with LTO
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: d.g.gorbachev at gmail dot com

cat > foo.c
char *foo(unsigned n)
{
  char *s = __builtin_calloc(1, n);
  return __builtin___strcat_chk(s, " ", __builtin_object_size(s, 0));
}
^D
$ gcc -O -flto -shared foo.c
foo.c: In function 'foo':
foo.c:1:7: internal compiler error: in execute_todo, at passes.c:1795
 char *foo(unsigned n)
       ^
0x84e3f13 execute_todo
        ../../gcc-5/gcc/passes.c:1795
Please submit a full bug report,
[...]

[Bug tree-optimization/62238] [4.9/5 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |lto
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-26
   Target Milestone|---                         |4.9.2
            Summary|ICE with LTO on valid code  |[4.9/5 Regression] ICE with
                   |on x86_64-linux-gnu in      |LTO on valid code on
                   |verify_ssa (in 64-bit mode) |x86_64-linux-gnu in
                   |                            |verify_ssa (in 64-bit mode)
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed, triggered by predictive commoning.

[Bug tree-optimization/62238] [4.9/5 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.9.2                       |4.9.3

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 4.9.2 has been released.

[Bug tree-optimization/62238] [4.9/5 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I will have a look.

[Bug tree-optimization/62238] [4.9 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|lto                         |
      Known to work|                            |5.0
            Summary|[4.9/5 Regression] ICE with |[4.9 Regression] ICE with
                   |LTO on valid code on        |LTO on valid code on
                   |x86_64-linux-gnu in         |x86_64-linux-gnu in
                   |verify_ssa (in 64-bit mode) |verify_ssa (in 64-bit mode)

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk sofar.

[Bug tree-optimization/62238] [4.9 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 26 09:43:39 2014
New Revision: 218074

URL: https://gcc.gnu.org/viewcvs?rev=218074&root=gcc&view=rev
Log:
2014-11-26  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/62238
    * tree-predcom.c (ref_at_iteration): Unshare the expression
    before gimplifying it.
    (prepare_initializers_chain): Discard unused seq.

    * gcc.dg/torture/pr62238.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr62238.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-predcom.c

[Bug tree-optimization/62238] [4.9 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
      Known to fail|                            |4.9.2

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 26 11:42:44 2014
New Revision: 218078

URL: https://gcc.gnu.org/viewcvs?rev=218078&root=gcc&view=rev
Log:
2014-11-26  Richard Biener  <rguenther@suse.de>

    Backport from mainline
    2014-11-26  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/62238
    * tree-predcom.c (ref_at_iteration): Unshare the expression
    before gimplifying it.

    * gcc.dg/torture/pr62238.c: New testcase.

    2014-11-25  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/61927
    * tree-vect-loop.c (vect_analyze_loop_2): Revert ordering
    of group and pattern analysis to the one in GCC 4.8.

    2014-11-07  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/63605
    * fold-const.c (fold_binary_loc): Properly use element_precision
    for types that may not be scalar.

    * gcc.dg/vect/pr63605.c: New testcase.

    2014-10-28  Richard Biener  <rguenther@suse.de>

    PR middle-end/63665
    * fold-const.c (fold_comparison): Properly guard simplifying
    against INT_MAX/INT_MIN with !TYPE_OVERFLOW_WRAPS.

    * gcc.dg/pr63665.c: New testcase.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/pr63665.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/torture/pr62238.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.dg/vect/pr63605.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/fold-const.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_9-branch/gcc/tree-predcom.c
    branches/gcc-4_9-branch/gcc/tree-vect-loop.c

[Bug tree-optimization/62238] [4.9 Regression] ICE with LTO on valid code on x86_64-linux-gnu in verify_ssa (in 64-bit mode)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62238

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
      Known to fail|                            |4.9.2

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.